Hey.
Though you have only one month for preparation .
So all you can do is start reading the concepts and theories.
First of all you should well prepare your NCERT books.
Than
You can prepare following topics.
Physical and inorganic chemistry.
Algebra
Statistics
Geometry
Electrostatic
Lens
Rarefaction
Fluid
Thermo

Good luck

You need to work at highest level of your capability. 

Read Read Read. Read textbooks everyday. Understand the concept behind the chapter. After finishing the chapter solve as many questions as possible of that respective chapter. 

Focus on every subject equally. If the focus is only on one or two subjects then it is of no good. So give equal time and attention to every subject. 

Make notes of formulas so that you can revise it one day before by just looking at it. 

Don't exhaust yourself too much that you can't study the other day. Health is important too. 

If you still have any queries feel free to ask in the comment section down below.

All the best.

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